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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c35400e86ac147263b4e023e21016ebb91fc8842dc08620d3c4fc8c4a8b51c37' 
  AND token = '6omKZW3lG9m64AfGYbTue6jeGzooKcdRZS2bSurB5JI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}